OpenGrok

OpenGrok is an open-source, self-hosted code search and cross-reference engine. It indexes large mono-repos or many projects and provides fast full-text, definition/identifier, path, and history search via a web UI and REST API. It integrates with Universal Ctags for language-aware cross-references and understands history from many SCMs (Git, Mercurial, Subversion, Perforce, ClearCase, and more). Deploy it as a Java webapp (WAR) on Tomcat/GlassFish, point it at your source roots, and use the indexer to keep results fresh with incremental updates. Features include syntax-highlighted browsing with x-refs, per-project configuration, a type-ahead suggester, blame/annotate views, downloadable files, and Docker-based setups for quick starts. Licensed under CDDL and actively maintained by Oracle and the community.